nest:nesting
In the garden I have long found myself dwelling among birds building, nurturing, protecting and then abandoning their nests. My fascination with nests led me to begin exploring both nest and nesting as subject.
definitions
nest n.
A structure made or a place chosen by a bird in which to lay and incubate its eggs and (frequently) to rear its young. (OED)
nesting, adj.
That makes or occupies a nest. (OED)
nest, intransitive verb*
: to build or occupy a nest : settle in or as if in a nest (MW)
: to fit compactly together or within one another (MW)